1* RS485 serial communications 2 3The RTS signal is capable of automatically controlling line direction for 4the built-in half-duplex mode. 5The properties described hereafter shall be given to a half-duplex capable 6UART node. 7 8Required properties: 9- rs485-rts-delay: prop-encoded-array <a b> where: 10 * a is the delay beteween rts signal and beginning of data sent in milliseconds. 11 it corresponds to the delay before sending data. 12 * b is the delay between end of data sent and rts signal in milliseconds 13 it corresponds to the delay after sending data and actual release of the line. 14 15Optional properties: 16- linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485 17 feature at boot time. It can be disabled later with proper ioctl. 18- rs485-rx-during-tx: empty property that enables the receiving of data even 19 whilst sending data. 20 21RS485 example for Atmel USART: 22 usart0: serial@fff8c000 { 23 compatible = "atmel,at91sam9260-usart"; 24 reg = <0xfff8c000 0x4000>; 25 interrupts = <7>; 26 atmel,use-dma-rx; 27 atmel,use-dma-tx; 28 linux,rs485-enabled-at-boot-time; 29 rs485-rts-delay = <0 200>; // in milliseconds 30 }; 31 32